Edwin presoott



(No Model.)

E. PRESOOTT.

JACK.

No. 444,849. Patented Jan. 20,1891.

w: Numus Panna co., mummmm, wAsmNcwN. n. c,

UNITED STATES PATENT OFFICE.

EDVN PRESOOTT, OF ARLIGTON, MAS SACHUSETTS.

JACK.

SPECIFICATION forming part of Letters Patent No. 444,849, dated January20, 1891.

Application filed January 28, 1890. Serial No. 338,386. (No model.)

.To all whom it may concern:

' representing like parts.

Prior to my invention a jack has been prov1ded at itsforward end with awheel, the axle for the latter being fixed in the base of the jack butin such plan the wheel and axle must be of sufficient strength towithstand the load put on the jack.

In my invention I have combined a wheel with the movable notchedlifting-head of the jack, so that when the said member is thrown down byelevating the handle of the jack the periphery of the said wheel willoccupy a position below the base of the jack to run on the floorwhen thejack is to be moved from place to place, the lowering of the jack-handle to raise the notched lifting-head raising the wheel fromthefloor, the wheel in such construction not being subjected to strainby reason of the load on the jack, and consequently the wheel and itsaxle maybe very much lighter. The notched lifting-head occupies adiagonal position and is supported by links at or near its upper andlower ends, one of the said links having its fulcrum at a considerabledistance from the other in a longitudinal plane, such location of thefulora of the said links enabling the notched head to be set at a veryconsiderable inclination to thereby provide for wider notches and betterengagement with the axle, and also to support the notched head morerigidly and firmly under its load, the notched head rising and fallingsubstantially perpendicularly, flsuch inclination also enabling thehorizontal parts of the notches of the jack to be of greater width thanwhen the head is perpendicular, as in United States Patent No. 207,442,dated August 27, 1878, heretofore granted to me.`

The perpendicular part of each notch is protected by non-metallic strapswhich may be of leather or rubber bent to cover the upper end of theVertical side of the notch and leave an open space between the coveringand the faces of the head.

t journal 7 of a wheel f.

Figure 1 in side elevation representsa jack embodying my invention, thedotted lines showing the lifting-head of the jack as elevated. Fig. 2 isan elevation of Fig. 1, looking` at it from the left.

The base a of the jack has a standard a' and a brace a2 risingtherefrom, the standard a' being inclined npwardly from the front of thebase toward the pivotal point for the handle b, which handle is insertedin a suitable iron or end piece b'. The brace (L2, as herein shown, hasat each side suitable brace-irons as, which, as represented, are boltedto the base at 2 and are bolted through at their upper ends by a bolt 3,the said bolt serving as the fulcrum for the pair of links c, which areparallel, the upper end of each link being connected to the iron b'loosely by a bolt or ear 4. The lifting-head d is placed in an inclinedposition, as best shown in Fig. 1, and is supported by, as herein shown,a pair of links or arms e e'. The links c `are pivoted at 5 and a bolt 6is extended through the links between their ends, the said bolt enteringa suitable iron or eye 82, attached to the lower end of the head CZ, theouter end of the links e receiving between them the axle or The pair oflinks c' have their f ulcra on the bolt 3 and are jointed at 8 to thelifting-head, and the iron b' has suitable pivotal connections, as 10,and as herein shown. The said pivotal connectionsone at each side thehandle-are jointed to a pair of irons 12, suitably secured to theliftimg-head. By placing the fulcrum 5 of the link e at a considerabledistance from the fulcrum 3 of the link e' with relation to a horizontalplane, it is possible to give very considerableinclination to thenotched head in order that the notches may be made broader to gainbetter hold upon the axle to be lifted, and at the same time thislocation of the fulcra of the links (which location has not before beenused in jacks so far as I am aware) enables the notched head to be morestrongly and rigidly supported, and also be moved in a substantiallyVertical direction. The powel` to raise the notched head is transferredthereto through a link connected with a level' near the upper end of thenotched head. The liftimg-head is provided, as herein sl1own,with a IOOseries ot' notches to form shoulders with horizontal and Vertical sides,each notch being at a different height from the other notches so as toadapt the jack to carriages of different styles.

"l`o protect the sides of the axle from injury from the Verticalshoulders, I have represented the said shoulders as covered with stripsof leather, or it may be rubber orother elastic material at g, the saidstrips covering' the Vertical sides of the shoulders'and the corners atthe top of the Vertical sides, the covering' being' so placed as toleave a slight space 20 between it and the face of the notches to affordgreater elasticity.

I do not herein broadly claim a cushion applied to a jack; but thespecific form of cushion shown and claimed has not to my knowledge beenused, nor has a cushion of the kind described been attached by metalliccaps. As herein represented, I have fastened the upper end of each stripby means of a metal cap h, which is titted to the horizontal shoulderand there secured in any suitable manner. When the operator engages thehandle b and lifts it into the full line position, the head being' thenin its lowest position, the periphery of the wheel frests upon the floorand the bottom of the base a is or may be a quarter of an inch or moreabove the floor, so that the jack may be readily rolled from place toplace or rolled under the carriage to be lifted. VVhen the handle ispushed down into the dotted-line position, the head is lifted, and Whilebeing lifted it, through suitable connections described, lifts the wheelinto the dotted-line position, Figi. 1, so it will be seen that thewheel and its axle are not subjected to any of the strain put upon thejack. By inclining' the liftinghead, as shown, it is possible to makewider horizontal shoulders to fit against the under side of the axlethan would be practicable were the standard a' and the head next to itinv substantially Vertical position, as in the patent referred to.

In my invention it will be noticed that by placing the head in inclinedposition the jack when operated has substantially the same extent ofniovement at every shoulder, so that whether a carriage with the lowestor the highest axle adapted to be lifted by the jack is to be raised,the lift of the carriag'e-axle from the floor will be substantially thesame.

I'Iaving described my invention, I desire to state that I believe myselfto be the first to employ in connection with the jack a wheel which islifted from the floor when the notched head is lifted to elevate anaxle, and I therefore do not desire or intend to limit this in- Ventionto the exact form of device or contrivanc'e shown for so lifting` thewheel, as such construction might be varied or modified withoutdeparting' frommy invention.

I claiml. A jack having` a base, a standard thereon, and a co-operatingnotched lifting-head, combined with a wheel and connections between itand the said notched head, the said wheel being adapted to run on thefloor when the notched head is down and to occupy a position above thefloor when the notched head is raised, substantially as described.

2. A jack having' a base, a standard, a notched lifting-head, pivotedlinks connecting the lower end of the head and the standard, and a Wheeland connections between it and the said notched head, whereby the saidwheel may run on the floor When the notched head is down, the Wheelbeing lifted above the floor by the upward movement of the said headwhen the jack is in use, substantially as described.

3. In a jack, the base, the inclined standard, pivoted links e and e',having their fulcra thereon, one at a considerable distance from theother with relation to a horizontal plane, combined with a notchedlifting-head to which the outer end of the said links are connected, andwith a lever and links t-o connect the same with the said standard andwith the said notched head, whereby the latter is raised in asubstantially Vertical direction, substantially as described.

4. In a jack, the notched lifting-head, combined with the non-metallicstrips covering `the Vertical faces and upper corners of the saidnotches, and with metallic coVering-caps placed upon the horizontalparts of the said notches, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing' witnesses.

EDWIN PRESCOT' Witnesses:

GEO. W. GREGORY, EMMA J. BENNETT.

IOG

